. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. GIRDLES AND LIMBS OF THE PRISTEROGNATHID THEROGEPHALIA 129 heavy bone with greatly expanded ends and a short thickened shaft. The rota- tion of the ends on the shaft apparently varies from io° to 250. The proximal surface has the processus medialis and processus lateralis indistinctly demarcated from the caput which is narrowly oval in outline. The facet of the caput curves a little on to the dorsal surface of the humerus. The delto-pectoral crest is fairly weak and this subsides into the shaft without continuing as a
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. GIRDLES AND LIMBS OF THE PRISTEROGNATHID THEROGEPHALIA 129 heavy bone with greatly expanded ends and a short thickened shaft. The rota- tion of the ends on the shaft apparently varies from io° to 250. The proximal surface has the processus medialis and processus lateralis indistinctly demarcated from the caput which is narrowly oval in outline. The facet of the caput curves a little on to the dorsal surface of the humerus. The delto-pectoral crest is fairly weak and this subsides into the shaft without continuing as an oblique ridge in the direction of the entepicondylar a Fig. 3. Diagrams of the pristerognathid humerus, a, dorsal, b, ventral. c, proximal, advl —anterior dorso-ventral line, bf—bicipital fossa, br —origin of the m. brachialis. cap —caput humeralis. d—insertion of the m. deltoideus. dpc— delto-pectoral crest, ect —ectepicondyle (radial), ecf—ectepicondylar foramen, ent—entepicondyle (ulnar), enf—entepicondylar foramen. Id—insertion of the m. latissimus dorsi. 1ml —latero-medial line, of—fossa for olecranon (trochlear), pi —processus lateralis, pm—processus medialis. re —radial condyle or capitel- lum. tr—origin of the medial head of the triceps, uc—ulnar condyle. The bicipital fossa is deep with a strong rounded posterior rim whose posterior face forms a rectangular area for the origin of the medial head of the triceps. The proximo-dorsal surface of the humerus is divided by the anterior dorso-ventral line (ADVL) into two parts. Anteriorly (preaxially) to this line lies the roughly triangular surface for the insertion of the m. deltoideus. On the surface posterior (postaxially) of the ADVL there is a weak oblique latero- median line (LML). Anterior to this line the area of insertion indicates a strong m. latissimus dorsi. Posterior to the LML a well-developed rectangular area indicates the origin of a strong medial head of the m.
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Keywords: ., bookauthorsouthafr, bookcentury1800, bookdecade1890, bookyear1898
